Only days after confirming that Pluto does not have rings, NASA has announced that dwarf planet Haumea does have a particulate ring, making it the only dwarf planet known to have a ring. The same scientists who discovered Haumea’s rings previously discovered rings around the centaur asteroid Chariklo, which orbits between Saturn and Uranus. The formation of rings around small celestial bodies raises questions for astronomers about ring formation.For more information…